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Based on the models describing the behaviour of neoclassical tearing modes (NTMs), fits for the seed-island triggered excitation and disappearance of these modes at small Beta values have been tested for an extended parameter range in the p(pi) �v(ii) plane in ASDEX Upgrade. The disappearance of NTMs at the marginal Beta (p,marg) during power ramp-down phases provides input for a direct comparison with models without the influence of the seed-island size. It has been found that for low q95 the NTM remains present until the HL-transition, whereas for higher q95 the mode decays well in H-mode. Scalings for the onset and the marginal Beta (p) for the (3/2)-NTM and the analysis of marginal Beta (p) for the (2/1)-NTM are presented.

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Authors: MARASCHEK M, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching (DE);GÜNTER S, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching (DE);ZOHM H, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching (DE);SAUTER O, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);GUNTER S, Max-Planck-Institut fur Plasmaphysik, EURATOM Association, Garching (DE)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 45 (July 2003) 1369-1384
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Record Number: 200316708 / Last updated on: 2003-09-03
Original language: en
Available languages: en